Alex Pro Firearms Apf Armory M16 Bolt Carrier Group Sp4 5.56 223 300 Blk

The APF Armory M16 Bolt Carrier Group SP4 5.56/223/300 BLK Black from Alex Pro Firearms delivers superior performance with SP4-coated components machined to military specifications and made in the USA, offering a longer product lifespan, high hardness, and extremely high lubricity for reliable operation in extreme conditions. This BCG features a hybrid DLC SP4 coating that blends hardness (2500-3500 HV) with ductility to resist brittleness, reduce friction, and dramatically extend wear life while requiring minimal maintenance and little to no lubrication. Tested in the mountains of Alaska at -44F and deployed in desert environments with no lubrication, SP4 delivers proven endurance across demanding environments, complemented by ASTM 85 Salt Fog resistance for dependable corrosion protection. The bolt is hand-polished with a chrome-lined bore, and the gas key is staked with gas rings, while every component—from the firing pin cam pin to the extractor and cam pin—receives Swiss or CNC-machined SP4 coating for consistent performance. This SP4-coated Full Auto carrier, heat-treated and shot-peened, combines high hardness with low friction to keep your rifle cycling smoothly under demanding use.